The CAS Registry Mumber 85462-11-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,4,6 and 2 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 85462-11: (7*8)+(6*5)+(5*4)+(4*6)+(3*2)+(2*1)+(1*1)=139 139 % 10 = 9 So 85462-11-9 is a valid CAS Registry Number.